bpmn-js-spiffworkflow/app/fileOperations.js

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// FileSaver isn't really a dependency, we use it here to provide an example.
// eslint-disable-next-line import/no-extraneous-dependencies
import FileSaver from 'file-saver';
/** ****************************************
* Below are a few helper methods so we can upload and download files
* easily from the editor for testing purposes.
* -----------------------------------------
*/
export default function setupFileOperations(bpmnModeler) {
/**
* Just a quick bit of code so we can save the XML that is output.
* Helps for debugging against other libraries (like SpiffWorkflow)
*/
const btn = document.getElementById('downloadButton');
btn.addEventListener('click', (_event) => {
saveXML();
});
async function saveXML() {
const { xml } = await bpmnModeler.saveXML({ format: true });
const blob = new Blob([xml], { type: 'text/xml' });
FileSaver.saveAs(blob, 'diagram.bpmn');
}
/**
* Just a quick bit of code so we can open a local XML file
* Helps for debugging against other libraries (like SpiffWorkflow)
*/
const uploadBtn = document.getElementById('uploadButton');
uploadBtn.addEventListener('click', (_event) => {
openFile(displayFile);
});
function displayFile(contents) {
bpmnModeler.importXML(contents).then(() => {});
}
}
function clickElem(elem) {
const eventMouse = document.createEvent('MouseEvents');
eventMouse.initMouseEvent(
'click',
true,
false,
window,
0,
0,
0,
0,
0,
false,
false,
false,
false,
0,
null
);
elem.dispatchEvent(eventMouse);
}
export function openFile(func) {
const readFile = function readFileCallback(e) {
const file = e.target.files[0];
if (!file) {
return;
}
const reader = new FileReader();
reader.onload = function onloadCallback(onloadEvent) {
const contents = onloadEvent.target.result;
fileInput.func(contents);
document.body.removeChild(fileInput);
};
reader.readAsText(file);
};
let fileInput = document.createElement('input');
fileInput.type = 'file';
fileInput.style.display = 'none';
fileInput.onchange = readFile;
fileInput.func = func;
document.body.appendChild(fileInput);
clickElem(fileInput);
}